Novel permanent magnet auxiliary synchronous reluctance motor

Abstract

The utility model discloses a novel permanent magnet auxiliary synchronous reluctance motor, and belongs to the technical field of synchronous reluctance motors. Comprising a plurality of overlapped silicon steel sheets, rotating holes are formed in the surfaces of the silicon steel sheets, and the silicon steel sheets are provided with a plurality of magnetic barrier sets and magnet grooves in the circumferential direction; only the permanent magnets are mounted in the magnet grooves, so that the use amount of the permanent magnets can be reduced, the dependence on the permanent magnets is remarkably reduced, the use amount of expensive materials is reduced, the cost is reduced, the economical efficiency is improved, in addition, environmental benefits are brought by reducing the use amount of the permanent magnets, and meanwhile, the weight of the whole silicon steel sheet can be reduced by reducing the number of the permanent magnets; by arranging the fixing piece and the base, the base and the overlapped silicon steel sheets are overlapped, after overlapping, the connecting plate on the outer side of the base is located at the edge of the overlapped silicon steel sheets, and under the cooperation of the fixing bolt and the threaded groove, the limiting plate can seal and cover the opening end of the magnet groove; and connection loosening or falling between the permanent magnet and the magnetic barrier is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of synchronous reluctance motors, and in particular relates to a novel permanent magnet assisted synchronous reluctance motor. Background Art

[0002] Permanent magnet synchronous motors are widely used in many industrial production fields due to their high output torque, high efficiency, high power factor and other characteristics. Permanent magnet assisted synchronous reluctance motors are a combination of built-in permanent magnet synchronous motors and synchronous reluctance motors. This type of motor has a high salient rotor structure and can generate greater reluctance torque, thereby reducing the use of permanent magnets. Therefore, permanent magnet assisted synchronous reluctance motors have received great attention.

[0003] In existing permanent magnet assisted synchronous reluctance motors, the rotor structure is usually designed in a symmetrical manner (as shown in the manual). Figure 7 As shown in the figure, the symmetrical design has a significant defect. The magnetic barrier groups arranged on the silicon steel sheets are all provided with permanent magnets. The permanent magnets arranged in each magnetic barrier group mean that more permanent magnet materials are needed, which will lead to a significant increase in cost. Especially when high-performance and high-cost rare earth permanent magnet materials are used, the cost problem is more prominent. At the same time, the connection between the permanent magnet and the magnetic barrier group is generally made by adhesives, and the connection strength of the adhesives is often limited. Especially in harsh environments such as high temperature, high humidity or vibration, the adhesives may lose viscosity, causing the connection between the permanent magnet and the magnetic barrier to loosen or fall off. This instability may affect the performance and reliability of the entire system. Summary of the invention

[0004] The utility model aims to provide a novel permanent magnet assisted synchronous reluctance motor in view of the problems existing in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a new type of permanent magnet assisted synchronous reluctance motor, comprising a plurality of stacked silicon steel sheets, the surface of the silicon steel sheets is provided with rotating holes, the silicon steel sheets are provided with a plurality of magnetic barrier groups and magnet slots along the circumferential direction, permanent magnets are installed on the inner side of the magnet slots, and the silicon steel sheets are provided with fixing parts for limiting and fixing the permanent magnets.

[0006] By adopting the above technical solution, the magnet slots and magnetic barrier groups are integrated into several stacked silicon steel sheets, and their configuration is optimized. This design not only eliminates the mutual constraints between the magnetic barrier group design and the permanent magnet design, simplifies their respective design processes, but also allows the selection of a more suitable thickness for the magnetic barrier group to improve the reluctance torque.

[0007] Optionally, the angle between the center lines of adjacent magnetic barrier groups is 30°-60°, and several magnetic barrier groups are symmetrically distributed with the center point of the silicon steel sheet as the base point. The distance between several magnetic barrier groups and the center point of the silicon steel sheet is not less than 2 / 3 of the radius of the silicon steel sheet, and several magnetic barrier groups are close to the outer edge of the silicon steel sheet.

[0008] By adopting the above technical solution, the symmetrical distribution of the magnetic barrier group ensures the dynamic balance of the rotor during operation and maintains the mass symmetry in the axial direction.

[0009] Optionally, each of the plurality of magnetic barrier groups comprises a plurality of magnetic barrier grooves, the plurality of magnetic barrier grooves are arranged radially at intervals, and the intervals between the plurality of magnetic barrier grooves are the same.

[0010] By adopting the above technical solution, the number of magnetic barrier groups is reduced, thereby reducing the number of slots on the silicon steel sheets, which not only reduces the complexity of the manufacturing process but also effectively improves the overall mechanical strength of the rotor.

[0011] Optionally, the plurality of magnetic barrier grooves are all concave, and the lengths of the plurality of magnetic barrier grooves increase sequentially from the edge to the center point of the silicon steel sheet.

[0012] By adopting the above technical solution, the design of the magnetic barrier groove is optimized and the magnetic circuit is improved.

[0013] Optionally, the magnet slot is configured to be one or more of a straight line, a concave shape and a V shape, and the opening angle of the V-shaped magnet slot is greater than 90° and less than 180°, and there are two permanent magnets on the inner side of the V-shaped magnet slot.

[0014] By adopting the above technical solution and combining different types of magnet slots with permanent magnets, it is possible to synchronously maximize the permanent magnet torque and the reluctance torque at the same current angle.

[0015] Optionally, the fixing part includes a base installed on the back side of the silicon steel sheet, a connecting plate is fixedly connected to the outer side of the base, an end of the connecting plate away from the base is fixedly connected to a limiting plate, a fixing bolt is provided on the surface of the limiting plate, and a threaded groove is opened on the surface of the silicon steel sheet for docking with the fixing bolt.

[0016] By adopting the above technical solution and setting the fixing piece, the connection between the permanent magnet and the magnet slot can be strengthened, so that the permanent magnet is installed firmly and is not easy to fall off.

[0017] Optionally, the thickness of the base is greater than the thickness of a single silicon steel sheet, and a through hole matching the rotating hole is opened on the surface of the base.

[0018] By adopting the above technical solution and the arrangement of the through hole, the arrangement of the base is not likely to affect the silicon steel sheet.

[0019] Optionally, the connecting plate is an elastic member, and the connecting plate is arranged in a one-to-one correspondence with the magnet slot.

[0020] By adopting the above technical solution, the connecting plate is an elastic member, so that the connecting plate can be bent, thereby facilitating the installation of the silicon steel sheet.

[0021] Optionally, a surface of the limiting plate is provided with a through hole, and the through hole corresponds to the position of the thread groove.

[0022] By adopting the above technical solution and setting the fixing bolts, the installation of the permanent magnet is made simple and convenient.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] 1. Only the permanent magnet is installed in the magnet slot, so the amount of permanent magnet used can be reduced, which significantly reduces the dependence on permanent magnets, reduces the use of expensive materials, reduces costs, and improves economy. In addition, reducing the amount of permanent magnets also brings environmental benefits. At the same time, the reduction in the number of permanent magnets can reduce the weight of the entire silicon steel sheet; 2. By reducing the number of magnetic barrier groups, the steps and complexity in the manufacturing process will be reduced, thereby simplifying the overall production process and improving production efficiency; 3. By setting a fixing part and a base, the base can be overlapped with the overlapped silicon steel sheets. After overlap, the connecting plate on the outside of the base is located at the edge of the overlapped silicon steel sheets. Under the cooperation of the fixing bolts and the threaded grooves, the limit plate can cover the open end of the magnet slot, thereby avoiding the loosening or falling off of the connection between the permanent magnet and the magnetic barrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the combined structure of the concave-shaped magnet slot and the magnetic barrier group of the utility model;

[0026] Figure 2 This is a schematic diagram of the connection structure between the fixing piece and the silicon steel sheet of the utility model;

[0027] Figure 3 This is a schematic diagram of the three-dimensional structure of the fixing member of the utility model;

[0028] Figure 4 This is a schematic diagram of the combined structure of the I-shaped magnet slot and the magnetic barrier group of the utility model;

[0029] Figure 5 This is a schematic diagram of the combined structure of the V-shaped magnet slot and the magnetic barrier group of the utility model;

[0030] Figure 6 It is a schematic diagram of the three-dimensional combined structure of the concave-shaped magnetic slot and the magnetic barrier group of the utility model;

[0031] Figure 7The figure is a schematic diagram of the combined structure of the existing magnetic barrier group and the permanent magnet of the utility model.

[0032] In the figure: 1, silicon steel sheet; 2, rotating hole; 3, magnetic barrier group; 4, magnet slot; 5, permanent magnet; 6, fixing piece; 61, base; 611, through hole; 62, connecting plate; 63, limiting plate; 631, through hole; 64, fixing bolt; 65, threaded groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "middle", "upper", "lower", "left", "right", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0035] like Figure 1 —6, the specific scheme of the embodiment is as follows: a new type of permanent magnet assisted synchronous reluctance motor, comprising a plurality of stacked silicon steel sheets 1, the surface of the silicon steel sheet 1 is provided with a rotating hole 2, the rotating hole 2 is located at the center of the silicon steel sheet 1, and the rotating hole 2 can be passed through by the rotating shaft, the silicon steel sheet 1 is provided with a plurality of magnetic barrier groups 3 and magnet slots 4 along the circumferential direction, as shown in the appendix of the specification Figure 1 As shown, the number of magnetic barrier groups 3 is four, and the specifications of the four magnetic barrier groups 3 are the same, the angle between the center lines of adjacent magnetic barrier groups 3 is 45°, and the magnetic barrier groups 3 are symmetrically distributed with the center point of the silicon steel sheet 1 as the base point, the spacing between the magnetic barrier groups 3 and the center point of the silicon steel sheet 1 is not less than 2 / 3 of the radius of the silicon steel sheet 1, and the magnetic barrier groups 3 are close to the outer edge of the silicon steel sheet 1;

[0036] The plurality of magnetic barrier groups 3 each include a plurality of magnetic barrier slots, as shown in the attached manual. Figure 1As shown, the number of magnetic barrier grooves is three, and the plurality of magnetic barrier grooves are arranged at intervals in the radial direction, and the spacing between the plurality of magnetic barrier grooves is the same, the plurality of magnetic barrier grooves are all concave, and the length dimensions of the plurality of magnetic barrier grooves increase successively from the edge to the center point of the silicon steel sheet 1, and the increase specification is more than twice that of the previous magnetic barrier groove, and the spacing between the inner side walls of the plurality of magnetic barrier grooves is the same, the magnet slot 4 is arranged in one or more of a straight line, a concave shape and a V shape, and the opening angle of the V-shaped magnet slot 4 is greater than 90° and less than 180°;

[0037] A variety of different permanent magnet pole types are integrated in the rotor laminations together with the reluctance pole types. This design not only eliminates the mutual constraints between the designs of the magnetic barrier group 3 and the permanent magnet 5, and simplifies their respective design processes, but also allows a more suitable thickness to be selected for the magnetic barrier group 3 to enhance the reluctance torque. More importantly, by combining two types of magnetic barrier groups 3 with magnet slots 4 and angularly offsetting the magnet slots 4, it is possible to simultaneously maximize the permanent magnet torque and the reluctance torque at the same current angle, thereby significantly enhancing the total synthesized torque and effectively improving the torque utilization rate.

[0038] The inner side of the magnet slot 4 is provided with a permanent magnet 5. When the magnet slot 4 is arranged in a straight line, as shown in the attached manual, Figure 5 As shown, the permanent magnet 5 is located in the middle of the magnet slot 4. When the magnet slot 4 is set in a V shape, as shown in the appendix of the specification Figure 6 As shown, there are two permanent magnets 5 inside the V-shaped magnet slot 4, and the two permanent magnets 5 are installed at the angle connection of the magnet slot 4;

[0039] By combining two different magnetic barrier groups 3 and magnet slots 4 and offsetting the magnet slots 4 at a specific angle, a significant improvement in the magnetic circuit design is achieved. This unique asymmetric layout effectively reduces torque pulsation when the motor is running; by eliminating the coupling relationship between the magnetic barrier and the permanent magnet, the magnetic barrier design can be better optimized. By improving the magnetic circuit, increasing the salient pole ratio, and adjusting the magnetic flux angle generated by the stator end, the angle between the stator current vector and the stator current is increased, and the phase difference between the voltage and the stator current is reduced, thereby improving the power factor, making the silicon steel sheet 1 structure more concise, easy to process and manufacture, achieving higher processing efficiency and production convenience, shortening the production cycle, and also reducing the risk of errors and defects that may occur in the production process, reducing the number of slots in the silicon steel sheet 1, not only reducing the complexity of the manufacturing process, but also effectively improving the overall mechanical strength of the rotor, thereby enhancing its stability and reliability under high-speed rotation and high-load conditions.

[0040] The silicon steel sheet 1 is provided with a fixing member 6 for limiting and fixing the permanent magnet 5;

[0041] The fixing member 6 includes a base 61 installed on the back of the silicon steel sheet 1. The diameter of the base 61 is the same as the diameter of the silicon steel sheet 1. The thickness of the base 61 is greater than the thickness of the single silicon steel sheet 1. The surface of the base 61 is provided with a through hole 611 matching the rotating hole 2. The through hole 611 is set so that the rotating shaft can pass through the base 61. The outer side of the base 61 is fixedly connected with a connecting plate 62. The connecting plate 62 is an elastic member. The number of the connecting plates 62 is four. The connecting plates 62 and the magnetic The body grooves 4 are arranged one by one, the length of the connecting plate 62 is adapted to the thickness of the plurality of stacked silicon steel sheets 1, the end of the connecting plate 62 away from the base 61 is fixedly connected to the limiting plate 63, the surface of the limiting plate 63 is provided with a through hole 631, the surface of the limiting plate 63 is provided with a fixing bolt 64, the fixing bolt 64 is located on the inner side of the through hole 631, the surface of the silicon steel sheet 1 is provided with a thread groove 65 connected with the fixing bolt 64, and the position of the thread groove 65 is connected with the position of the through hole 631;

[0042] The silicon steel sheet 1 with the magnetic barrier group 3 and the magnet slot 4 is overlapped, and the permanent magnet 5 is placed in the magnet slot 4, and the elastic connecting plate 62 is pulled open to overlap the overlapped silicon steel sheet 1 with the base 61. After overlapping, the overlapped silicon steel sheet 1 is rotated to make the threaded groove 65 and the through hole 631 on the limit plate 63 to be positioned. After docking, the limit plate 63 is located at the upper end of the permanent magnet 5, and the fixing bolt 64 is rotated to make the limit plate 63 cover the surface of the magnet slot 4.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel permanent magnet assisted synchronous reluctance motor, characterized in that: The invention comprises a plurality of stacked silicon steel sheets (1), wherein a rotation hole (2) is provided on the surface of the silicon steel sheet (1), wherein the silicon steel sheet (1) is provided with a plurality of magnetic barrier groups (3) and magnet slots (4) along the circumferential direction, wherein a permanent magnet (5) is installed inside the magnet slot (4), and a fixing member (6) for limiting and fixing the permanent magnet (5) is provided on the silicon steel sheet (1).

2. A novel permanent magnet assisted synchronous reluctance motor according to claim 1, characterized in that: The angle between the center lines of adjacent magnetic barrier groups (3) is 30°-60°, and the magnetic barrier groups (3) are symmetrically distributed with the center point of the silicon steel sheet (1) as the base point, the distance between the magnetic barrier groups (3) and the center point of the silicon steel sheet (1) is not less than 2 / 3 of the radius of the silicon steel sheet (1), and the magnetic barrier groups (3) are arranged close to the outer edge of the silicon steel sheet (1).

3. A novel permanent magnet assisted synchronous reluctance motor according to claim 2, characterized in that: A plurality of the magnetic barrier groups (3) respectively comprise a plurality of magnetic barrier grooves, and the plurality of magnetic barrier grooves are arranged at intervals along the radial direction.

4. A novel permanent magnet assisted synchronous reluctance motor according to claim 3, characterized in that: The plurality of magnetic barrier grooves are all concave, and the lengths of the plurality of magnetic barrier grooves increase sequentially from the edge to the center of the silicon steel sheet (1).

5. The novel permanent magnet assisted synchronous reluctance motor according to claim 1 is characterized in that: The magnet slot (4) is arranged in one or more of a straight shape, a concave shape and a V shape, and the opening angle of the V-shaped magnet slot (4) is greater than 90° and less than 180°, and there are two permanent magnets (5) inside the V-shaped magnet slot (4).

6. The novel permanent magnet assisted synchronous reluctance motor according to claim 1 is characterized in that: The fixing member (6) comprises a base (61) mounted on the back side of the silicon steel sheet (1), a connecting plate (62) being fixedly connected to the outer side of the base (61), an end of the connecting plate (62) away from the base (61) being fixedly connected to a limiting plate (63), a fixing bolt (64) being provided on the surface of the limiting plate (63), and a threaded groove (65) being provided on the surface of the silicon steel sheet (1) for docking with the fixing bolt (64).

7. A novel permanent magnet assisted synchronous reluctance motor according to claim 6, characterized in that: The thickness of the base (61) is greater than the thickness of the single silicon steel sheet (1), and a through hole (611) matching the rotary hole (2) is provided on the surface of the base (61).

8. The novel permanent magnet assisted synchronous reluctance motor according to claim 6 is characterized in that: The connecting plate (62) is an elastic member, and the connecting plate (62) is arranged in a one-to-one correspondence with the magnet slots (4).

9. The novel permanent magnet assisted synchronous reluctance motor according to claim 6 is characterized in that: A through hole (631) is provided on the surface of the limiting plate (63), and the position of the through hole (631) corresponds to the position of the thread groove (65).

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